单项选择题

In the mass extinction 65 million years ago, ______ of all species on earth vanished.

A．two thirds
B．half
C．90%
D．30%
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单项选择题
Why was Leacock dubbed as a pro-American British imperialist
A．Because he was a Briton who adored American politics.
B．Because he liked to read American newspapers.
C．Because he lectured on the importance of friendship between U.S. and Britain.
D．Because he chose to live close to Americ
单项选择题
The author was probably ______.
A．a historian
B．a reporter
C．Leacock's colleague
D．a Navy officer
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